One button operation, easy to use, the test can be completed in 22 seconds. LCD display for easy reading According to the degree of alcohol exceeding the limit, different beeping sounds will be emitted. Using highly sensitive semiconductor sensors, fast speed and accurate data. Powered by 3 AAA batteries.(This product does not include batteries) Product Name: Alcohol Tester Detection : Semiconductor gas sensor Measurement range of alcohol concentration in exhaled breath: 0-200mg/100mL Current: 120mA Measurement object: Alcohol concentration in exhaled breath Battery configuration: 3 No. 7 batteries (AAA 1.5V) Sensor replacement: not possible Voltage: 4.5V Operating temperature range -5 C~45C Product weight: 75g Storage temperature range: -20 C~50 C Colour:Black Material:Plastic Size:120mm x 56mm x 17mm Package Contents: 1x Alcohol Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.